My understanding is Commiefornia's CARB banned/blocked the 392 & Hellcat engines (not sure why exactly) and all the blue, knee-pad states that signed on & agreed to go with whatever shit CARB barfs up were 'obligated' (since they clearly can't think for themselves) to go along. Stellantis grew a backbone & said F U, we'll make them anyway & sell in the other states.